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Cheap flights from St. Louis to Sofia from $309

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from St. Louis to Sofia departing on 10/12. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from St. Louis to Sofia

Cheap round-trip flights

Enter your travel dates to find the best prices.
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$828Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$831Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:10 am - 3:38 pm
SOF
-
STL
17h 28m
2 stops
$836Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$867Lufthansa
Wed, Sep 9 - Wed, Sep 16
United Airlines Logo
7:00 am - 11:40 am
STL
-
SOF
20h 40m
3 stops
United Airlines Logo
6:10 am - 3:38 pm
SOF
-
STL
17h 28m
2 stops
$868United Airlines
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
12:59 pm - 12:10 pm
STL
-
SOF
15h 11m
2 stops
Lufthansa Logo
6:10 am - 3:38 pm
SOF
-
STL
17h 28m
2 stops
$875Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$888Lufthansa
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$890Lufthansa
Wed, Sep 9 - Wed, Sep 16
Multiple Airlines Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Multiple Airlines Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$911Multiple Airlines
Wed, Sep 9 - Wed, Sep 16
Lufthansa Logo
3:30 pm - 6:05 pm
STL
-
SOF
18h 35m
1 stop
Lufthansa Logo
6:20 am - 1:25 pm
SOF
-
STL
15h 05m
1 stop
$913Lufthansa
Wed, Sep 9 - Wed, Sep 16

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Lufthansa flights from St. Louis to Sofia

Our best Lufthansa deals on St. Louis to Sofia flight tickets
Lufthansa
Sep 9
STL12:59 pmLambert-St Louis
15h 11m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$828
Lufthansa
Sep 9
STL12:59 pmLambert-St Louis
15h 11m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:20 amSofia
15h 05m
1 stop
STL1:25 pmLambert-St Louis
$831
Lufthansa
Sep 9
STL12:59 pmLambert-St Louis
15h 11m
2 stops
SOF12:10 pmSofia
Sep 16
SOF6:10 amSofia
17h 28m
2 stops
STL3:38 pmLambert-St Louis
$836

United Airlines flights from St. Louis to Sofia

Our best United Airlines deals on St. Louis to Sofia flight tickets
United Airlines
Sep 9
STL7:00 amLambert-St Louis
20h 40m
3 stops
SOF11:40 amSofia
Sep 16
SOF6:10 amSofia
17h 28m
2 stops
STL3:38 pmLambert-St Louis
$868
United Airlines
Jul 27
STL10:20 amLambert-St Louis
28h 55m
2 stops
SOF11:15 pmSofia
Aug 3
SOF6:10 amSofia
39h 15m
2 stops
STL1:25 pmLambert-St Louis
$936
United Airlines
Sep 26
STL5:36 pmLambert-St Louis
34h 34m
2 stops
SOF12:10 pmSofia
Oct 17
SOF6:20 amSofia
20h 21m
2 stops
STL6:41 pmLambert-St Louis
$979

momondo Fare Finder

 
Customize your flight search to find flights from St. Louis to Sofia that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated June 14, 2026.
Use the filters below to find and compare flights from St. Louis to Sofia that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$828

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$831

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:10 am-3:38 pm

2 stops17h 28m

$836

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$867

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

7:00 am-11:40 am

3 stops20h 40m

Sofia

Wed 9/16

6:10 am-3:38 pm

2 stops17h 28m

$868

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

12:59 pm-12:10 pm

2 stops15h 11m

Sofia

Wed 9/16

6:10 am-3:38 pm

2 stops17h 28m

$875

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$888

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$890

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$911

St. LouisSofia

STL - SOF

STLSOF

Lambert-St Louis

Wed 9/9

3:30 pm-6:05 pm

1 stop18h 35m

Sofia

Wed 9/16

6:20 am-1:25 pm

1 stop15h 05m

$913

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first
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See travel insights to Sofia from

How to get the cheapest flight ticket from St. Louis to Sofia

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the typical price of a round-trip flight between St. Louis and Sofia?

What is the cheapest month to fly to Sofia?

The cheapest month to fly to Sofia from St. Louis is in October. Flight prices, which tend to average around $0, are often lower during this time because this is during the off-season. If you aren’t able to travel during the month of October, then book flights to Sofia from St. Louis during January instead. Flights to Sofia in January, while not as cheap as those in October, still average around $528.

Can stopping save me money on St. Louis to Sofia flights?

You could potentially save up to 19% on your flight if you consider stops on a St. Louis to Sofia flight.

When to book flights from St. Louis to Sofia

Are you open to changing your travel dates? Check out the ideal times to fly from St. Louis to Sofia according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap St. Louis to Sofia (STL to SOF) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from St. Louis to Sofia

Fastest flight time

15h 11m

Direct flights

None
The fastest flight from St. Louis to Sofia takes 15h 11m
There are no direct flights from St. Louis to Sofia. There are no popular flight routes from St. Louis to Sofia.
Search flight deals

Frequently asked questions about flying from St. Louis to Sofia

  • How far is Lambert-St Louis to Sofia by plane?

    A flight from Lambert-St Louis to Sofia will travel around 5441.0 mi. 15h 11m is a normal flight duration for this route.

  • When did momondo last update prices for flights from Lambert-St Louis Airport to Sofia Airport?

    Prices for flights from Lambert-St Louis Airport to Sofia Airport are updated daily.

  • How many operators does momondo search for flights from Lambert-St Louis Airport to Sofia Airport?

  • How old do you have to be to fly from Lambert-St Louis Airport to Sofia Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Lambert-St Louis Airport to Sofia Airport.

  • What documentation or ID do you need to fly to Sofia Airport?

    The travel and health documents you'll need for your trip to Sofia Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Sofia Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular airline from St. Louis to Sofia?

Best airlines flying from St. Louis to Sofia

Compare and see reviews for airlines that fly from St. Louis to Sofia with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $559Free CancellationRating
7.4
9,826 reviews
Search United Airlines flights
LufthansaPriceFrom $567Free CancellationRating
6.8
8,062 reviews
Search Lufthansa flights
Air CanadaPriceFrom $1,108Free CancellationRating
7.1
11,193 reviews
Search Air Canada flights

Traveling to a place near Sofia?

Book flights to Sofia if you plan to visit one of these locations
Bansko
Borovets
Velingrad
Sandanski

Why use momondo?

Why should I use momondo to find a flight deal from St. Louis to Sofia?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from St. Louis to Sofia. momondo saves you time and could save you money on your trip.

Can I find flights from St. Louis to Sofia with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Sofia from St. Louis with this policy.

How can momondo help me find flights from St. Louis to Sofia?

Once all potential St. Louis to Sofia flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from St. Louis to Sofia right now. Can momondo alert me if prices change?

Price alerts on flights to Sofia from St. Louis are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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Fly your favorite airline to Sofia

Airlines are sorted and displayed according to clicks in the past 7 days on momondo
Lufthansa
United Airlines
Air Canada